JPH0680347B2 - Lubrication device for differential mechanism of automatic transmission for vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a differential mechanism lubrication device for an automatic transmission for a vehicle, and particularly to a forced lubrication device suitable for a three-axis automatic transmission for a vehicle.

[Conventional technology]

For a three-axis vehicle in which a first shaft that is connected to an output shaft of an engine via a fluid transmission device, a second shaft that is a counter shaft, and three shafts of an output shaft of a differential mechanism that is connected to an axle are arranged in parallel Conventionally, in an automatic transmission, a sufficient amount of lubricating oil that covers the output shaft is placed in a differential case (hereinafter referred to as a differential case) that forms the bottom of the transmission case, and the lubricating oil is agitated by rotating the differential gear. Lubrication was done.

[Problems to be solved by the invention]

However, if the distance between the three axes is shortened for mounting on a small-sized vehicle, if a large amount of lubricating oil is put into the differential case as in the conventional case, the lubricating oil will be scattered and the amount that enters the first or second shaft side will increase. However, since it contacts the high-speed rotating portion of the gear transmission mechanism provided on the first shaft or the second shaft, the power loss due to the drag of the lubricating oil increases. On the contrary, if the amount of lubricating oil is reduced, the differential gear and side bearings will be insufficiently lubricated.

Under such circumstances, there has been proposed a lubricating device of the type in which oil flows down from above the differential mechanism, as shown in JP-A-54-146326. In this device, an oil supply pipe connected to the outlet of the torque converter via an oil supply hose is provided in a protruding manner in the housing, and is opened near the outer periphery of the differential case.

By the way, in order to supply the oil to the inside through the transparent window of the differential case which is rotating at a high speed with such a device, at least the outer edge of the front edge of the differential window in the rotation direction passes through the inner edge of the rear edge of the window. In order to maintain strength, the oil must be provided with a flow-down velocity that exceeds the wall thickness of the permeable window peripheral edge of the differential case before passing through it. The oil must be discharged from the pipe in this state, and the amount of discharge also increases considerably from the amount originally required for lubrication. as a result,
A large-capacity pump corresponding to this is required. Therefore, it is difficult to say that the above-mentioned technology is an effective solution to the above-mentioned demand for reduction in size and weight. In addition, sending a large amount of oil to the high-speed rotating part causes a new problem such as heat generation due to stirring of the oil.

On the other hand, the vehicle's differential mechanism must be prepared in advance by supplying a sufficient amount of lubricating oil at the time of starting, and due to an increase in engine load during sudden acceleration (power on) during traveling. Prevents heat generation and oil film breakage due to increased load on the differential mechanism, and further reduces μ
It is not enough to simply supply a certain amount of lubricating oil to deal with heat generation and oil film breakage due to excessive rotation of the differential gear when slipping on the road or when escaping from the derailment. Such conventional techniques are not sufficient.

In view of this, the present invention provides a differential mechanism lubrication device that enables compactification of an automatic transmission for a vehicle by increasing the flow rate of lubricating oil and enabling effective lubrication without increasing the supply amount more than necessary. The purpose is to provide. A further object of the present invention is to provide a differential mechanism lubrication device capable of supplying a lubricating oil amount according to the load by changing the supply pressure according to the engine load of the vehicle.

[Means for solving problems]

In order to achieve the above-mentioned object, the differential mechanism lubrication device for an automatic transmission for a vehicle according to the present invention is such that one side of an oil passage for guiding lubricating oil is used as a pressure regulating valve for regulating the hydraulic pressure supplied to the fluid transmission device of the automatic transmission. While connecting, the other side of the oil passage is connected to the differential mechanism lubricating oil passage, and the lubricating oil from the pressure regulating valve is injected at the end of the differential mechanism lubricating oil passage toward the center of the gearbox of the differential gear. It is characterized in that a nozzle for doing so is provided.

[Operation and effect of the invention]

In the present invention described above, since the lubricating oil from the pressure regulating valve whose temperature has not risen is increased toward the center of the gearbox of the differential gear by increasing the flow velocity through the nozzle, the lubricating gearbox is rotated. In the rotational direction of the window, the lubricating oil is supplied with a flow velocity that exceeds the wall thickness of the perimeter edge of the thick gearbox between the passage of the outer edge of the front edge and the passage of the inner edge of the rear edge of the window. Therefore, the lubricating oil can be sufficiently supplied into the gear box, and the effect of lubricating and cooling the differential gear without increasing the oil amount can be obtained without increasing the pump capacity.
Moreover, the pressure of the lubricating oil changes according to the engine load of the vehicle due to the pressure regulating action of the pressure regulating valve, and it becomes possible to supply the amount of lubricating oil according to the load, so that in the differential mechanism of the vehicle,
It is possible to supply sufficient amount of lubricating oil at the time of start-up to prepare for running, and also to generate heat due to an increase in the load of the differential mechanism due to an increase in engine load during sudden acceleration (power on) during running. And prevent the oil film from running out,
Further, it is possible to obtain an effect that it is possible to sufficiently cope with heat generation, oil film breakage, and the like due to over-rotation of the differential gear at the time of slipping on a low μ road or at derailing.

〔Example〕

 Next, the present invention will be described based on the embodiments shown in the drawings.

FIG. 1 is a front sectional view of an automatic transmission for a three-axis vehicle, that is, a second section.
The ABCDE section in the figure and Fig. 2 show the FG section in Fig. 1. 100 is a transmission case, 200 is a fluid transmission consisting of a fluid torque converter, 300 is a first shaft, 400 is a main gear transmission installed on the first shaft, and 500 is parallel to the first shaft. And a second shaft, 600 is a sub-gear transmission provided on the second shaft, and 700 is a first shaft and a second shaft composed of a pair of transmission gears 701 and 702 mounted on the ends of the first shaft and the second shaft. , 800 is a differential gear in which output shafts 801 and 802, which are wheel drive shafts, are arranged in parallel with the first shaft, and 900 is an oil pan mounted below the main gear transmission 400 of the transmission case 100. Is. The transmission case 100 includes an engine side case 140, a main case 180, and a rear cover 190. The engine side case 140 has a fastening surface 101 with the engine body opened, and a torque converter case housing the torque converter 200. 110, a differential case 120 located laterally and slightly below the differential case 120, in which the differential mechanism is housed, a torque converter case 110, and a differential case 120.
And the auxiliary gear transmission cover 130 forming a side wall of the auxiliary gear transmission room, which is located slightly above the main gear 180, is integrally cast, and the main case 180 is the torque converter case 110.
A main transmission room 150, which is arranged coaxially with the main gear transmission, and a sub-transmission room 160, which is arranged in parallel with the main transmission room 150 and has an opening on the engine side end closed by the cover 130.
And a differential cover 170 attached to the differential case 120, and the rear cover 190 is fastened to the side of the main case 180 opposite to the engine and covers the transmission mechanism 700. In this three-axis automatic transmission, as shown in FIG. 2, the oil level in the differential case 120 is L1 to L2 when cold.
At the time of temperature rise, L1 'to L2' levels (both are idle at neutral) are filled with lubricating oil.
The oil level is well below the rotational axis of the differential gear.

Next, the differential mechanism lubricating device of the above-mentioned vehicle automatic transmission will be described. FIG. 3 shows a circuit portion related to lubrication in the hydraulic control device of the automatic transmission. 10 is an oil strainer provided in the oil pan 900, 11 is hydraulic oil from the oil pan 900 via the oil strainer 10. The oil pump that sucks up and discharges to the oil passage 12, 13 regulates the oil pressure of the oil passage 12 according to the input oil pressure corresponding to the vehicle running conditions such as engine load, vehicle speed, output shaft torque, etc., and the line pressure to the oil passage 12A. A primary regulator valve that generates excess oil and supplies excess oil to the oil passage 15, and 14 adjusts the oil pressure in the oil passage 15 according to the input oil pressure that corresponds to the vehicle traveling conditions, and supplies it to the torque converter 200 as torque converter pressure. A secondary regulator valve for supplying an excess pressure to the oil passage 16 as a lubricating pressure, and a throttle valve 17 for outputting a throttle pressure according to the throttle opening to the oil passage 18. In this embodiment, the secondary regulator valve 14 constitutes a pressure regulating valve, and the lubricating oil supplied from the valve to the oil passage 16 is filtered by the lubricating oil strainer 1, while the lubricating oil is passed through the differential mechanism lubricating oil passage 5. Is jetted from the jet nozzle 2 to the differential gear 800, and is supplied to a lubricating oil supply passage 501 (see FIG. 1) to the auxiliary gear transmission 600 formed at the axis of the second shaft 500, while the other is supplied. so,
It is also supplied from the side bearing lubricating oil passage 6 to the differential side bearing 4 via the orifice 3.

FIG. 4 shows the main part of the HL section in FIG. Reference numeral 21 denotes a filter cover fastened to the mounting surface 20 of the lubricating oil strainer 1 provided on the differential cover side surface 22 of the differential case 120. The filter cover 21 has a lubricating oil supply passage to the differential gear 800 and the auxiliary gear transmission 600. A line 23 for forming 5 and a line pressure supply pipe 24 for the governor valve are attached. Lubricating oil strainer 1
As shown in FIG. 5, the mounting surface 20 of the lubricating oil strainer 1 is connected with a recess 25 for mounting the lubricating oil strainer 1 through a groove 26,
Recess for connecting to the lubricating oil passage 6 to the side bearing 4
27 is provided, and the bottom of the oil strainer mounting recess 25 is
As shown in FIG. 6, it is connected to the oil passage 16 provided in the wall of the differential case 120. The lubricating oil strainer 1 is held on the end surface of the differential case by the filter cover 21 to facilitate maintenance and inspection.

7 and 8 show a lubricating oil strainer 1 in which a filter 1G is stretched, and an elliptical sealing edge 1A is provided with a pair of protrusions 1C and 1D which come into contact with a filter cover when mounted, The bottom 1B is provided with a ridge 1E that abuts the bottom of the recess 25, the bottom 1B and the edge 1A are connected by four fulcrums 1F, and a reinforcing partition plate 1H is provided in the middle of the inside. .

As described above, the differential mechanism lubrication device for an automatic transmission for a vehicle according to the above-described embodiment has the jet nozzle 2 that injects the pressure oil, which is boosted by the pressure regulating valve, that is, the secondary regulator valve 14, from above toward the center of the gear box of the differential gear. From the side bearing lubricating oil passage 6 for supplying lubricating oil to the side bearings via the attached differential gear lubricating oil passage 5 and the orifice 3, and the lubricating oil strainer 1 provided upstream of the jet nozzle 2 and the orifice 3 of these oil passages. Since this is a forced lubrication device, the differential gear or side bearings can be sufficiently lubricated while reducing the amount of lubricating oil to be put in the differential case, which enables compactification of the 3-axis automatic transmission without power loss. It will be possible. Further, since the lubricating oil strainer 1 is provided upstream of the jet nozzles 2 and the orifices 3 of the lubricating oil passages 5 and 6, it is possible to prevent the jet nozzles 2 or the orifices 3 from being clogged and prevent malfunction of the forced lubrication device.

Although the present invention has been described above in detail based on an embodiment, the present invention is not limited to the above-described embodiment, and various specific configurations are changed within the scope of the matters described in the claims. It goes without saying that it can be implemented by

[Brief description of drawings]

FIG. 1 is a front sectional view of a three-axis vehicle automatic transmission according to an embodiment, FIG. 2 is an FG sectional view of the same, and FIG. 3 is a partial view of a hydraulic control device showing a lubrication circuit of the embodiment. 1 is a partial view of the HL sectional view of FIG. 1, FIG. 5 is a plan view of a lubricating oil strainer mounting surface of the embodiment, FIG. 6 is a sectional view showing a lubricating oil strainer mounting hole of the embodiment, FIG. FIG. 8 is a perspective view of the lubricating oil strainer of the embodiment. 1 ... Lubricating oil strainer, 2 ... Jet nozzle, 3 ...
Orifice, 4 ... Side bearing, 5 ... Differential mechanism lubricating oil passage, 6 ... Side bearing lubricating oil passage,
14 ... Secondary regulator valve (pressure regulating valve), 16 ... Oil passage for guiding lubricating oil, 200 ... Torque converter (fluid transmission device), 800 ... Differential gear

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Morisawa 1 Toyota-cho, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. 56) References Japanese Unexamined Patent Publication No. 54-146326 (JP, A) Actual development No. 54-75731 (JP, U)

Claims (5)

[Claims] Claim: What is claimed is: 1. One side of an oil passage that guides lubricating oil is connected to a pressure regulating valve that regulates the hydraulic pressure supplied to a fluid transmission of an automatic transmission, and the other side of the oil passage is connected to a differential mechanism lubricating oil passage. The differential mechanism lubricating oil passage has an end portion provided with a nozzle for injecting the lubricating oil from the pressure regulating valve toward the center of the gear box of the differential gear. Differential mechanism lubricator. 2. The differential for an automatic transmission for a vehicle according to claim 1, wherein the pressure regulating valve regulates the hydraulic pressure supplied to the fluid transmission of the automatic transmission according to the throttle pressure. Mechanism lubricator. 3. The differential mechanism lubricating device for an automatic transmission for a vehicle according to claim 1, wherein the oil passage has a strainer upstream of the nozzle. 4. The oil passage is branched, and is connected to a side bearing lubricating oil passage of a differential mechanism through an orifice, and the oil passage is connected to the side bearing lubricating oil passage.
Item 13. A differential mechanism lubrication device for an automatic transmission for a vehicle according to paragraph. 5. The oil passage is connected to a side bearing lubricating oil passage of a differential mechanism through an orifice, and a strainer is provided upstream of the orifice according to any one of claims 1 to 3. A differential mechanism lubricating device for an automatic transmission for a vehicle as described above.